Regulation 6 Accurate determination of actual calorific value not possible

Where, at any measurement place at which measurement directions require a relevant supplier to determine the actual calorific values of gas supplied by him in any area, the supplier is unable for a continuous period in excess of four hours (in this regulation referred to as “the relevant four hour period”) to determine those values accurately the actual calorific value determined at that place in respect of the gas supplied in that area on any day on which any part of the relevant four hour period falls shall be deemed to be an amount which is equal to 95% of the declared calorific value in force with respect to the area in question on that day, but so that in calculating the actual calorific value–

This regulation does not apply in a case where the reason for the supplier’s inability to determine the actual calorific values of gas supplied accurately is an interruption in the flow of gas and accordingly regulation 7 below applies.